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https://www.swelluk.com:443/fluval-marine-glo-t8-tubes/ 
Fluval Marine Glo T8 Tubes
Marine Glo T8 tunes come in a choice of size to suit your aquarium, and provide you with a strong blue actinic light, which is perfect for your reef system.
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Product Information
The Marine Glo is a Actinic Blue bulb, that is ideal for saltwater systems, with a strong blue light that is designed to highlight fluorescent colours in your corals, as well as photosynthetic invertebrates. This has the critical wavelength that is required for strong growth in your corals, and it will also help to enhance fish colours, especially blue and violet tones.
This normal output bulb fits all suitable standard and electronic ballasts, and it is recommended in combination with Life Glo 2 bulb, to provide a good rounded light spectrum.
This is available in:- 18w, 46cm / 18"
- 20w, 61cm / 24"
- 25w, 76cm / 30"
- 30w, 91 cm / 36"